#If the strings are not quoted, the filehandle STDOUT must be 
#specified, or the print function will treat the first word it 
#encounters as a filehandle (i.e., the word Hello would be treated 
#as a filehandle). The comma is not allowed after a filehandle; 
#it is used only to separate strings that are to be printed.
print STDOUT Hello, world, "\n";
print STDOUT "hello" , "are" , "uou";